My neighbor wants to introduce his 10 y.o. son to spearing. The kid is a fantastic swimmer though a bit small, we thought a used short pole spear would be ideal. He will likely grow out of it quickly. If anybody has one collecting dust let me know what you want for it.

You might want to tell your neighbor to get a normal sized polespear. Shorter spears can be a bit more dangerous because you can accidentally shoot yourself. And to accommodate for a youngster, you can get a longer, thinner band and as he grows and gets stronger, you can increase the band thickness while sticking with the same spear.

I would recommend a one piece, lightweight, aluminum, ~6ft pole. The one piece is more durable than the screw together "travel" spears. The lightweight is handy when you have a less powerful band.